Earliest immigrants to north america were required to adapt to which initial environmental challenge

The earliest immigrants to North America were required to adapt to the glaciers and ice.

These immigrants arrived during the period of Wisconsin glaciation when the ice and glacier caused the sea level to drop and hence the immigrants adapted to life in the icy climate. The drop in the sea level caused an exposure of a land bridge that connected Siberia and Alaska.

the hollywood film industry of 1950 was threatened on several different fronts. television broadcasting was rapidly becoming the dominant entertainment medium in the united states. the paramount anti-trust consent decree requiring separate ownership for production companies and theater chains had gone into effect on 1 january 1950. large numbers of young men and women were marrying, having children, and moving to the suburbs, which affected the viability of downtown first-run movie theaters. foreign revenues were endangered by protectionist tactics including quota systems, high taxes, and blocked funds. finally, the morality and patriotism of hollywood films and filmmakers were under attack from government, religious, and citizens' groups.

explanation:

answer: the ocean

explanation: if you map out 30 n and 40 n latitude, you will get the ocean